Home / 20,391.12-28,138.50-11,436.96

Finding the Fourth Proportional to 20,391.12, 28,138.50 and 11,436.96

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Solution

The fourth proportional to 20,391.12, 28,138.50 and 11,436.96 is: 15,782.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391.12 : 28,138.50 = 11,436.96 : x
  2. Step 2: Convert to fraction form
    20,391.12/28,138.50 = 11,436.96/x
  3. Step 3: Cross multiply
    20,391.12x = 28,138.50 × 11,436.96
  4. Step 4: Simplify right side
    20,391.12x = 321,818,898.96
  5. Step 5: Solve for x
    x = 321,818,898.96/20,391.12
  6. Step 6: Final answer
    x = 15,782.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.